======================================
| [ 36.142800][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [   36.143038][    C2]
| [   36.143128][    C2]
| [   36.143128][    C2] stack backtrace:
[   36.143832][    C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   36.144226][    C2] Call Trace:
[   36.144365][    C2]  <IRQ>
[ 36.144564][ C2] dump_stack_lvl (lib/dump_stack.c:117) 
[ 36.144749][ C2] print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 36.144970][ C2] ? __pfx_print_irq_inversion_bug.part.0 (kernel/locking/lockdep.c:4024) 
[ 36.145190][ C2] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 36.145474][ C2] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 36.145654][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:26) 
[ 36.145835][ C2] mark_lock_irq (kernel/locking/lockdep.c:4244) 
[ 36.146012][ C2] ? __pfx_mark_lock_irq (kernel/locking/lockdep.c:4207) 
[ 36.146293][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 36.146475][ C2] ? save_trace (kernel/locking/lockdep.c:586) 
[ 36.146652][ C2] mark_lock (kernel/locking/lockdep.c:4678) 
[ 36.146786][ C2] mark_usage (kernel/locking/lockdep.c:4567) 
[ 36.146924][ C2] __lock_acquire (kernel/locking/lockdep.c:5091) 
[ 36.147215][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 36.147391][ C2] ? ipv6_get_lladdr (net/ipv6/addrconf.c:1911 net/ipv6/addrconf.c:1934) 
[ 36.147566][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 36.147742][ C2] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 36.148028][ C2] ? ipv6_get_lladdr (net/ipv6/addrconf.c:1911 net/ipv6/addrconf.c:1934) 
[ 36.148204][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 36.148382][ C2] ? ipv6_get_lladdr (net/ipv6/addrconf.c:1911 net/ipv6/addrconf.c:1934) 
[ 36.148556][ C2] _raw_read_lock_bh (./include/linux/rwlock_api_smp.h:177 kernel/locking/spinlock.c:252) 
[ 36.148732][ C2] ? ipv6_get_lladdr (net/ipv6/addrconf.c:1911 net/ipv6/addrconf.c:1934) 
[ 36.149018][ C2] ipv6_get_lladdr (net/ipv6/addrconf.c:1911 net/ipv6/addrconf.c:1934) 
[ 36.149195][ C2] ndisc_send_ns (net/ipv6/ndisc.c:658) 
[ 36.149376][ C2] ? __pfx_ndisc_send_ns (net/ipv6/ndisc.c:653) 
[ 36.149556][ C2] ? __ipv6_chk_addr_and_flags (net/ipv6/addrconf.c:2009) 
[ 36.149780][ C2] ndisc_solicit (net/ipv6/ndisc.c:736) 
[ 36.149957][ C2] ? __pfx_ndisc_solicit (net/ipv6/ndisc.c:736) 
[ 36.150133][ C2] ? neigh_probe (net/core/neighbour.c:1074) 
[ 36.150312][ C2] neigh_probe (net/core/neighbour.c:1075) 
[ 36.150555][ C2] neigh_timer_handler (net/core/neighbour.c:1163) 
[ 36.150738][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 36.150913][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1083) 
[ 36.151089][ C2] call_timer_fn (kernel/time/timer.c:1793) 
[ 36.151379][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 36.151555][ C2] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1783) 
[ 36.151729][ C2] ? __pfx_call_timer_fn (kernel/time/timer.c:1770) 
[ 36.151907][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 36.152083][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 36.152373][ C2] __run_timers (kernel/time/timer.c:1845 kernel/time/timer.c:2418) 
[ 36.152546][ C2] ? __pfx_neigh_timer_handler (net/core/neighbour.c:1083) 
[ 36.152720][ C2] ? __pfx___run_timers (kernel/time/timer.c:2389) 
[ 36.152894][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 36.153185][ C2] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:115 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 36.153363][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 36.153537][ C2] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 36.153715][ C2] ? timer_expire_remote (kernel/time/timer.c:2429 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 36.154005][ C2] timer_expire_remote (kernel/time/timer.c:2430 kernel/time/timer.c:2422 kernel/time/timer.c:2181) 
[ 36.154178][ C2] tmigr_handle_remote_cpu (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:67 ./arch/x86/include/asm/irqflags.h:127 kernel/time/timer_migration.c:925) 
[ 36.154353][ C2] ? __pfx_tmigr_handle_remote_cpu (kernel/time/timer_migration.c:869) 
[ 36.154572][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 36.154857][ C2] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 36.154990][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 36.155168][ C2] tmigr_handle_remote_up (kernel/time/timer_migration.c:1003) 
[ 36.155343][ C2] tmigr_handle_remote (kernel/time/timer_migration.c:488 kernel/time/timer_migration.c:1061) 
[ 36.155518][ C2] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:115 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 36.155805][ C2] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1026) 
[ 36.155981][ C2] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4292 kernel/locking/lockdep.c:4359) 
[ 36.156199][ C2] __do_softirq (kernel/softirq.c:554) 
[ 36.156379][ C2] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) 
[ 36.156624][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   36.156798][    C2]  </IRQ>
[   36.156888][    C2]  <TASK>
[ 36.156980][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 36.157196][ C2] RIP: 0010:_raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 36.157650][ C2] Code: 10 e8 21 49 9b fd 48 89 ef e8 59 b9 9b fd 81 e3 00 02 00 00 75 1d 9c 58 f6 c4 02 75 29 48 85 db 74 01 fb 65 ff 0d 05 bf 2f 55 <74> 0e 5b 5d c3 cc cc cc cc e8 4f b3 be fd eb dc 0f 1f 44 00 00 5b
All code
========
   0:	10 e8                	adc    %ch,%al
   2:	21 49 9b             	and    %ecx,-0x65(%rcx)
   5:	fd                   	std
   6:	48 89 ef             	mov    %rbp,%rdi
   9:	e8 59 b9 9b fd       	call   0xfffffffffd9bb967
   e:	81 e3 00 02 00 00    	and    $0x200,%ebx
  14:	75 1d                	jne    0x33
  16:	9c                   	pushf
  17:	58                   	pop    %rax
  18:	f6 c4 02             	test   $0x2,%ah
  1b:	75 29                	jne    0x46
  1d:	48 85 db             	test   %rbx,%rbx
  20:	74 01                	je     0x23
  22:	fb                   	sti
  23:	65 ff 0d 05 bf 2f 55 	decl   %gs:0x552fbf05(%rip)        # 0x552fbf2f
  2a:*	74 0e                	je     0x3a		<-- trapping instruction
  2c:	5b                   	pop    %rbx
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	cc                   	int3
  32:	cc                   	int3
  33:	e8 4f b3 be fd       	call   0xfffffffffdbeb387
  38:	eb dc                	jmp    0x16
  3a:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  3f:	5b                   	pop    %rbx

Code starting with the faulting instruction
===========================================
   0:	74 0e                	je     0x10
   2:	5b                   	pop    %rbx
   3:	5d                   	pop    %rbp
   4:	c3                   	ret
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	cc                   	int3
   9:	e8 4f b3 be fd       	call   0xfffffffffdbeb35d
   e:	eb dc                	jmp    0xffffffffffffffec
  10:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  15:	5b                   	pop    %rbx
[   36.158388][    C2] RSP: 0018:ffffc900006ef528 EFLAGS: 00000286
[   36.158616][    C2] RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff5be5955
[   36.158880][    C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffaad40911
[   36.159250][    C2] RBP: ffff888001040cc0 R08: 0000000000000001 R09: fffffbfff5be38a9
[   36.159507][    C2] R10: ffffffffadf1c54f R11: 0000000000000200 R12: ffff888006011000
[   36.159755][    C2] R13: 0000000000000000 R14: ffffc900006ef578 R15: ffff888006227a00
[ 36.160123][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 36.160326][ C2] qlist_free_all (mm/kasan/quarantine.c:174) 
[ 36.160492][ C2] kasan_quarantine_reduce (./include/linux/srcu.h:285 mm/kasan/quarantine.c:287) 
[ 36.160656][ C2] __kasan_slab_alloc (mm/kasan/common.c:322) 
[ 36.160934][ C2] kmem_cache_alloc (./include/linux/kasan.h:201 mm/slub.c:3798 mm/slub.c:3845 mm/slub.c:3852) 
[ 36.161117][ C2] ? kernel_text_address (kernel/extable.c:97 kernel/extable.c:94) 
[ 36.161295][ C2] p9_tag_alloc (net/9p/client.c:285) 
[ 36.161472][ C2] ? __pfx_p9_tag_alloc (net/9p/client.c:277) 
[ 36.161647][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 36.161822][ C2] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 36.162006][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 36.162178][ C2] p9_client_prepare_req (net/9p/client.c:641) 
[ 36.162340][ C2] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 36.162610][ C2] ? __pfx_p9_client_prepare_req (net/9p/client.c:625) 
[ 36.162813][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 36.162978][ C2] p9_client_rpc (net/9p/client.c:688 (discriminator 4)) 
[ 36.163148][ C2] ? __pfx_p9_client_rpc (net/9p/client.c:672) 
[ 36.163417][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 36.163579][ C2] ? list_lru_add (mm/list_lru.c:106) 
[ 36.163742][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 36.163906][ C2] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 36.164187][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 36.164351][ C2] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 36.164518][ C2] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 36.164684][ C2] p9_client_clunk (net/9p/client.c:1438 (discriminator 3)) 
[ 36.164961][ C2] v9fs_dentry_release (fs/9p/vfs_dentry.c:54) 
[ 36.165133][ C2] __dentry_kill (fs/dcache.c:608) 
[ 36.165297][ C2] ? __pfx_kfree_link (fs/libfs.c:1573) 
[ 36.165464][ C2] dput.part.0 (fs/dcache.c:845) 
[ 36.165739][ C2] walk_component (fs/namei.c:562 fs/namei.c:1027 fs/namei.c:2009) 
[ 36.165906][ C2] link_path_walk.part.0.constprop.0 (fs/namei.c:2328) 
[ 36.166112][ C2] ? __pfx_link_path_walk.part.0.constprop.0 (fs/namei.c:2249) 
[ 36.166318][ C2] path_openat (fs/namei.c:3795) 
[ 36.166593][ C2] ? __pfx_path_openat (fs/namei.c:3781) 
[ 36.166756][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 36.166924][ C2] do_filp_open (fs/namei.c:3826) 
[ 36.167091][ C2] ? __pfx_do_filp_open (fs/namei.c:3820) 
[ 36.167361][ C2] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 36.167526][ C2] ? __pfx_kfree_link (fs/libfs.c:1573) 
[ 36.167691][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 36.167855][ C2] ? alloc_fd (fs/file.c:555 (discriminator 10)) 
[ 36.167983][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 36.168254][ C2] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 36.168421][ C2] ? alloc_fd (fs/file.c:555 (discriminator 10)) 
[ 36.168546][ C2] do_sys_openat2 (fs/open.c:1406) 
[ 36.168707][ C2] ? vfs_fstatat (fs/stat.c:308) 
[ 36.168983][ C2] ? __pfx_do_sys_openat2 (fs/open.c:1392) 
[ 36.169163][ C2] ? __pfx___do_sys_newfstatat (fs/stat.c:464) 
[ 36.169365][ C2] __x64_sys_openat (fs/open.c:1432) 
[ 36.169583][ C2] ? __pfx___x64_sys_openat (fs/open.c:1432) 
[ 36.169770][ C2] ? __pfx_do_faccessat (fs/open.c:465) 
[ 36.170047][ C2] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 36.170210][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[   36.170420][    C2] RIP: 0033:0x7f83f8aa30e8
[ 36.170600][ C2] Code: f9 41 89 f0 41 83 e2 40 75 30 89 f0 25 00 00 41 00 3d 00 00 41 00 74 22 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 30 c3 0f 1f 80 00 00 00 00 48 8d 44 24 08 c7
All code
========
   0:	f9                   	stc
   1:	41 89 f0             	mov    %esi,%r8d
   4:	41 83 e2 40          	and    $0x40,%r10d
   8:	75 30                	jne    0x3a
   a:	89 f0                	mov    %esi,%eax
   c:	25 00 00 41 00       	and    $0x410000,%eax
  11:	3d 00 00 41 00       	cmp    $0x410000,%eax
  16:	74 22                	je     0x3a
  18:	44 89 c2             	mov    %r8d,%edx
  1b:	4c 89 ce             	mov    %r9,%rsi
  1e:	bf 9c ff ff ff       	mov    $0xffffff9c,%edi
  23:	b8 01 01 00 00       	mov    $0x101,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 30                	ja     0x62
  32:	c3                   	ret
  33:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  3a:	48 8d 44 24 08       	lea    0x8(%rsp),%rax
  3f:	c7                   	.byte 0xc7

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 30                	ja     0x38
   8:	c3                   	ret
   9:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  10:	48 8d 44 24 08       	lea    0x8(%rsp),%rax
  15:	c7                   	.byte 0xc7
[   36.171407][    C2] RSP: 002b:00007ffd5cba9c18 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
[   36.171801][    C2] RAX: ffffffffffffffda RBX: 00007ffd5cba9eaf RCX: 00007f83f8aa30e8
[   36.172076][    C2] RDX: 0000000000080000 RSI: 00007ffd5cba9c90 RDI: 00000000ffffff9c
[   36.172348][    C2] RBP: 00007ffd5cba9c80 R08: 0000000000080000 R09: 00007ffd5cba9c90
[   36.172723][    C2] R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffd5cba9c97


Finger prints:
dump_stack_lvl:mark_lock_irq:mark_lock:mark_usage